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(CNN)Purists, rejoice: This year marks the 500th anniversary of the Reinheitsgebot, known in English as the German Beer Purity Law.

The set of regulations dates back to a 1516 decree outlining three permissible beer ingredients: hops, barley and water (yeast, while not specifically mentioned in the text of the law, is also acceptable).

This was a way to ensure the quality and integrity of German beer and to relegate grains like wheat and rye to baking bread instead of brewing beer.